21120210210210 has 16 divisors (see below), whose sum is σ = 50688504504576. Its totient is φ = 5632056056048.

The previous prime is 21120210210181. The next prime is 21120210210217. The reversal of 21120210210210 is 1201201202112.

It is a super-3 number, since 3×21120210210210³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21120210210210.

It is not an unprimeable number, because it can be changed into a prime (21120210210217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352003503474 + ... + 352003503533.

It is an arithmetic number, because the mean of its divisors is an integer number (3168031531536).

Almost surely, 2^{21120210210210} is an apocalyptic number.

21120210210210 is an abundant number, since it is smaller than the sum of its proper divisors (29568294294366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120210210210 is a wasteful number, since it uses less digits than its factorization.

21120210210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704007007017.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120210210210 its reverse (1201201202112), we get a palindrome (22321411412322).

The spelling of 21120210210210 in words is "twenty-one trillion, one hundred twenty billion, two hundred ten million, two hundred ten thousand, two hundred ten".